Hi, I decided to try this ROM, because with all ROMs from UMI my baterry lasted only few hours and phone was restarting like 5-10 times per day, but I got stucket, when I tried to wipe stuff accroding to your instructions, it says "unable to mount /system" and actually it says same message when try to install your ROM, but after that it says successful and after reboot it doesn't boot. Any idea how to fix this?
EDIT: I cannot even restore my backup, it says same message

now I'm without phone as this was my only phone. Somebody please help.